664435431464742 has 24 divisors (see below), whose sum is σ = 1645268687436816. Its totient is φ = 189838694704176.

The previous prime is 664435431464723. The next prime is 664435431464759. The reversal of 664435431464742 is 247464134534466.

It is a happy number.

664435431464742 is a `hidden beast` number, since 6 + 6 + 4 + 4 + 3 + 543 + 1 + 4 + 6 + 47 + 42 = 666.

It is a super-3 number, since 3×664435431464742³ (a number of 45 digits) contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is a self number, because there is not a number n which added to its sum of digits gives 664435431464742.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2636648537433 + ... + 2636648537684.

It is an arithmetic number, because the mean of its divisors is an integer number (68552861976534).

Almost surely, 2^{664435431464742} is an apocalyptic number.

664435431464742 is an abundant number, since it is smaller than the sum of its proper divisors (980833255972074).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

664435431464742 is a wasteful number, since it uses less digits than its factorization.

664435431464742 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5273297075132 (or 5273297075129 counting only the distinct ones).

The product of its digits is 557383680, while the sum is 63.

The spelling of 664435431464742 in words is "six hundred sixty-four trillion, four hundred thirty-five billion, four hundred thirty-one million, four hundred sixty-four thousand, seven hundred forty-two".